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Methods and systems for the preparation of cyclopentadiene and/or dicyclopentadiene

A kind of technology of dicyclopentadiene and cyclopentadiene, applied in the field of preparing cyclopentadiene and/or dicyclopentadiene and system

Active Publication Date: 2019-04-23
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, thermodynamic equilibrium constraints inhibit the conversion of acyclic C5 hydrocarbons to CPD when increasing CPD and / or hydrogen partial pressure

Method used

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  • Methods and systems for the preparation of cyclopentadiene and/or dicyclopentadiene
  • Methods and systems for the preparation of cyclopentadiene and/or dicyclopentadiene
  • Methods and systems for the preparation of cyclopentadiene and/or dicyclopentadiene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0230] In this example, the first reactor hydrocarbon effluent was produced from pure n-pentane feedstock and pure hydrogen co-feed at a hydrogen / n-pentane molar ratio of 1:2, without co-feeding light hydrocarbons or any downstream Recycle of the C5-rich fraction to the first reactor. Process temperature, pressure, weight hourly space velocity, and molecular weight at the reactor inlet were 475°C, 62 psia (401.9 kPa absolute), 15 hr -1 and 49.01 g / mol. The temperature and pressure at the reactor outlet were 575°C and 10 psia (68.9 kPa absolute), respectively. The reaction produced an additional 1.87 moles of molecules per mole of molecules in the total feed material at the inlet in the first reactor effluent leaving the outlet. This 1.87-fold molar expansion has the effect of reducing the molecular weight (from 49.01 g / mol at the inlet to 27.05 g / mol at the outlet) and density (from 3.08 kg / m 3 Reduced to 0.26kg / m at the exit 3 )Effect. The pressure drop from the inlet to...

Embodiment 2

[0234] The reactor inlet and outlet temperature and pressure were kept the same as in Example 1 above. However, in this example, the C5-rich stream produced as a 35% third C5-rich fraction obtained by separating the third reactor effluent produced by the second dimerization reactor described above is recycled to the first reactor, where it is mixed with n-pentane before being fed into the first reactor. Hydrogen is mixed with 1:2 H 2 / (all C5 hydrocarbons except (iso-C5 hydrocarbons and CPD)) molar ratio co-feed. It has been found experimentally that the reaction pathway from iso-C5 hydrocarbons to CPD is kinetically forbidden under the reaction conditions. The composition of the total feed to the first reactor is given in Table I below.

[0235] The remaining 65% of the third C5-rich fraction is used as a motor gasoline blend for making motor gasoline. The composition of the motor gasoline blends is also provided in Table I below.

[0236] In this example, to produce 100...

Embodiment 3

[0246] In this prophetic example obtained by simulation, a model third C5-rich fraction and corresponding partially hydrogenated motor gasoline composition for use as a motor gasoline blend can be obtained having the composition in Table II below:

[0247] Table II

[0248]

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PUM

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Abstract

Processes and systems for the production of cyclopentadiene and / or dicyclopentadiene comprising converting one or more acyclic C5 hydrocarbons to CPD in the presence of a C1-C4 co-feedstock in a first reactor to obtain a product mixture; separating said product mixture in a separation subsystem, such as a compressor train, to obtain a C5-rich fraction comprising CPD and substantially depleted in hydrogen and C1-C4 hydrocarbons; dimerizing said C5-rich fraction in a dimerization reactor, obtaining a product effluent comprising DCPD; said product effluent is then separated to obtain a DCPD-enriched fraction. Multiple stages of dimerization and separation steps can optionally be used to obtain multiple DCPD-enriched fractions of various purities and amounts. The C5-rich fractions from the various stages of the process can be recycled to the first reactor, or converted to motor gasoline components after selective hydrogenation. C5-rich fractions and motor gasoline components can optionally be separated to produce high value-added chemicals.

Description

[0001] Cross References to Related Applications [0002] This application claims priority and benefit from USSN 62 / 250,702 filed November 4, 2015 and EP16153729.5 filed February 2, 2016. field of invention [0003] The present invention relates to methods and systems for the preparation of cyclic C5s including cyclopentadiene and / or dicyclopentadiene. In particular, the present invention relates to methods and systems for the preparation of cyclopentadiene and dicyclopentadiene from acyclic C5 hydrocarbons. Background of the invention [0004] Cyclopentadiene (CPD) and its dimer dicyclopentadiene (DCPD) are highly desirable raw materials used in the chemical industry for a wide variety of products such as polymer materials, polyester resins, synthetic rubber, solvents , fuel, fuel additives, etc. Typically, cyclopentadiene is produced as a minor by-product in liquid feed steam cracking (such as naphtha and heavier feeds) processes. As the steam cracking process shifts to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C2/52C07C13/15C07C13/61B01J29/44B01D53/047B01D61/00B01D63/00
CPCC07C2/52C07C5/373C07C5/333C07C2529/44C07C2601/10C07C2603/68C07C13/15C07C13/61
Inventor L·L·亚西诺K·梁
Owner EXXONMOBIL CHEM PAT INC